fix: Skills allow underscore

[gewenyu99]

We have underscores in some skill names. This causes some errors

• Fix skill ID validation regex to allow underscores, unblocking integration-javascript_node and
  integration-javascript_web skills

[github-actions]

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Results will be posted here when complete.

[gewenyu99]

From the log, the agent tried these in order:

1. Exact ID (rejected by regex):
   Error: skillId must be lowercase alphanumeric with hyphens.
2. Guessed integration-javascript-node (not found):
   Error: skill "integration-javascript-node" not found. Use load_skill_menu to see available skills.
3. Guessed integration-javascriptnode (not found):
   Error: skill "integration-javascriptnode" not found. Use load_skill_menu to see available skills.
4. Guessed integration-node (not found):
   Error: skill "integration-node" not found. Use load_skill_menu to see available skills.
5. Fell back to MCP resource:
   MCP error -32602: Resource posthog://docs/frameworks/javascript_node not found